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Question about redundant power supplies
Hi all.. Seems busy in here lately.. Anyway, just a quick question about
redundant power supplies on any Proliants (since I suspect they'll all pretty much act the same).. I've got a 6400R with dual supplies and I stumbled across a HP page that had power calculators (in excel) where you could tell it what sort of processors you've got, how much RAM, how many drive bays are populated and what sort of power supplies you're using (single or double) and it will spit out the power consumption in terms of watts, amps, BTU's for heat output, etc. If what that spreadsheet indicates is correct, having the redundant power supply plugged in isn't really running it per-se as much as keep it ready just in case. I guess I was thinking that since each power supply (for the 6400 anyway) is 450W, that it *might* use as much as 900 watts total if both supplies were actually on at the same time. However, in my configuration, I'm using (more or less) ~415W of power and going from 1 supply to 2 doesn't even bump that number.. Does this seem reasonable without actually measuring the true consumption with a meter? Just thought I'd check if I was out to lunch or not.. Thanks! |
#2
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Question about redundant power supplies
"Rick F." wrote Hi all.. Seems busy in here lately.. Anyway, just a quick question about redundant power supplies on any Proliants (since I suspect they'll all pretty much act the same).. I've got a 6400R with dual supplies and I stumbled across a HP page that had power calculators (in excel) where you could tell it what sort of processors you've got, how much RAM, how many drive bays are populated and what sort of power supplies you're using (single or double) and it will spit out the power consumption in terms of watts, amps, BTU's for heat output, etc. If what that spreadsheet indicates is correct, having the redundant power supply plugged in isn't really running it per-se as much as keep it ready just in case. I guess I was thinking that since each power supply (for the 6400 anyway) is 450W, that it *might* use as much as 900 watts total if both supplies were actually on at the same time. However, in my configuration, I'm using (more or less) ~415W of power and going from 1 supply to 2 doesn't even bump that number.. Does this seem reasonable without actually measuring the true consumption with a meter? Just thought I'd check if I was out to lunch or not.. The power consumption of a server remains the same whether on 1 or 2 power supplies. For a power supply to be redundant, it has to be online and able to provide 100% of the servers power needs virtually immeduately, so when they're redundant, each power supply should be running at just under 50% capacity. Make sense? |
#3
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Question about redundant power supplies
Jez T wrote:
The power consumption of a server remains the same whether on 1 or 2 power supplies. How so? Each power supply includes circuitry for its control and monitoring, fans, and other power consuming components; surely running additional supplies increases total power consumption. Regards, Michael |
#4
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Question about redundant power supplies
On 2007-04-23, Jez T wrote:
The power consumption of a server remains the same whether on 1 or 2 power supplies. For a power supply to be redundant, it has to be online and able to provide 100% of the servers power needs virtually immeduately, so when they're redundant, each power supply should be running at just under 50% capacity. Make sense? Sounds reasonable I guess.. Unfortunately, I can't test the theory right now since my redundant supply is DOA and needs to be fixed/replaced (likely to be replaced since they're so cheap) |
#5
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Question about redundant power supplies
"Rick F." wrote in message ... On 2007-04-23, Jez T wrote: The power consumption of a server remains the same whether on 1 or 2 power supplies. For a power supply to be redundant, it has to be online and able to provide 100% of the servers power needs virtually immeduately, so when they're redundant, each power supply should be running at just under 50% capacity. Make sense? Sounds reasonable I guess.. Unfortunately, I can't test the theory right now since my redundant supply is DOA and needs to be fixed/replaced (likely to be replaced since they're so cheap) Rick, Two supplies will increase the current, but only slightly. The additional fan of the added supply consumes the most extra power but that's not much, the electronics will not consume enough to talk about. Jez T is correct in that the server load will be divided equally between the two supplies so the total power consumption of the server "proper" remains the same. Bottom line, you are adding one low current fan to the mix, not much for the added security. If you are concerned with power consumption, the single largest consumption of power that can be modified will be the CPU's. Chop it from four down to two and save a bunch. Remember, should you remove a cpu or two you have to install/plug in a terminator in it's place, Also be sure to unplug both power cords before removing or installing them. Oh, I never heard any more from you on those 4200/4300 enclosures. I'm getting ready to put a bunch of them (all flavors) on Ebay. Phil |
#6
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Question about redundant power supplies
On 2007-04-24, Phil wrote:
Two supplies will increase the current, but only slightly. The additional fan of the added supply consumes the most extra power but that's not much, the electronics will not consume enough to talk about. Jez T is correct in that the server load will be divided equally between the two supplies so the total power consumption of the server "proper" remains the same. Bottom line, you are adding one low current fan to the mix, not much for the added security. Sounds good.. If you are concerned with power consumption, the single largest consumption of power that can be modified will be the CPU's. Chop it from four down to two and save a bunch. Remember, should you remove a cpu or two you have to install/plug in a terminator in it's place, Also be sure to unplug both power cords before removing or installing them. I was just curious how the redundancy worked more or less.. I realize that I'm probably paying around $40/mo to run this thing if my poor math is correct.. We're about to start a remodel and I may either need to relocate this darned server to somewhere else for 4-6 months or shut it down completely during the remodel.. I think my brother may be able to shove it somewhere in his garage and get network access via wifi, but I'm not sure if I want to do that or not.. I looked into taking it to a local place that does on-site hosting so I could plug it into their network and power but it was going to cost about $600/mo.. Sheesh.. No thanks! If I disable the server than I guess I'll have to forward all email,etc.. What a pain.. Oh, I never heard any more from you on those 4200/4300 enclosures. I'm getting ready to put a bunch of them (all flavors) on Ebay. At this point, I'm in no hurry and will likely just wait for a while until after the remodel to do this.. Thanks for reminding me though.. |
#7
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Question about redundant power supplies
"Rick F." wrote in message ... On 2007-04-24, Phil wrote: Two supplies will increase the current, but only slightly. The additional fan of the added supply consumes the most extra power but that's not much, the electronics will not consume enough to talk about. Jez T is correct in that the server load will be divided equally between the two supplies so the total power consumption of the server "proper" remains the same. Bottom line, you are adding one low current fan to the mix, not much for the added security. Sounds good.. If you are concerned with power consumption, the single largest consumption of power that can be modified will be the CPU's. Chop it from four down to two and save a bunch. Remember, should you remove a cpu or two you have to install/plug in a terminator in it's place, Also be sure to unplug both power cords before removing or installing them. I was just curious how the redundancy worked more or less.. I realize that I'm probably paying around $40/mo to run this thing if my poor math is correct.. We're about to start a remodel and I may either need to relocate this darned server to somewhere else for 4-6 months or shut it down completely during the remodel.. I think my brother may be able to shove it somewhere in his garage and get network access via wifi, but I'm not sure if I want to do that or not.. I looked into taking it to a local place that does on-site hosting so I could plug it into their network and power but it was going to cost about $600/mo.. Sheesh.. No thanks! If I disable the server than I guess I'll have to forward all email,etc.. What a pain.. Oh, I never heard any more from you on those 4200/4300 enclosures. I'm getting ready to put a bunch of them (all flavors) on Ebay. At this point, I'm in no hurry and will likely just wait for a while until after the remodel to do this.. Thanks for reminding me though.. Rick, 40 is rather high unless you have every option that can be had. If it is 4 cpu, and in your case you don't need them, remove two cpu's and insert terminators in their place and power cost is usually 17ish a month average. That 6400 pulls a little less than the DL580 even with 4 gig of ram. That unit will also run on 1 cpu for even more savings. I may have terminators if you need them. Phil |
#8
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Question about redundant power supplies
On 2007-04-25, Phil wrote:
40 is rather high unless you have every option that can be had. If it is 4 cpu, and in your case you don't need them, remove two cpu's and insert terminators in their place and power cost is usually 17ish a month average. That 6400 pulls a little less than the DL580 even with 4 gig of ram. That unit will also run on 1 cpu for even more savings. I may have terminators if you need them. That $40 figure was a high-wild guess based on the max 450w power supply figure.. I do have quad CPU's and find them very peppy and could scale back to a couple if needed since I do have a bag full of terminators and space CPU's (550Mhz & 500Mhz models).. I might try that when its time to take the machine down.. Thanks! |
#9
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Question about redundant power supplies
Rick,
Some OS and/or versions won't utilize all 4 cpu's anyway. Check your OS. Phil "Rick F." wrote in message ... On 2007-04-25, Phil wrote: 40 is rather high unless you have every option that can be had. If it is 4 cpu, and in your case you don't need them, remove two cpu's and insert terminators in their place and power cost is usually 17ish a month average. That 6400 pulls a little less than the DL580 even with 4 gig of ram. That unit will also run on 1 cpu for even more savings. I may have terminators if you need them. That $40 figure was a high-wild guess based on the max 450w power supply figure.. I do have quad CPU's and find them very peppy and could scale back to a couple if needed since I do have a bag full of terminators and space CPU's (550Mhz & 500Mhz models).. I might try that when its time to take the machine down.. Thanks! |
#10
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Question about redundant power supplies
On 2007-04-26, Phil wrote:
Rick, Some OS and/or versions won't utilize all 4 cpu's anyway. Check your OS. Thanks Phil.. I'm actually running Fedora Core 6 and it is definitely using all 4 cpu's as shown below : top - 08:32:43 up 6 days, 8:27, 2 users, load average: 0.05, 0.01, 0.00 Tasks: 160 total, 1 running, 157 sleeping, 1 stopped, 1 zombie Cpu0 : 0.8%us, 0.2%sy, 0.6%ni, 98.3%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.1%us, 0.1%sy, 0.1%ni, 99.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 0.1%us, 0.1%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.5%us, 0.1%sy, 0.1%ni, 99.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1451184k total, 1413872k used, 37312k free, 309148k buffers Swap: 4096532k total, 3264k used, 4093268k free, 711484k cached I'd bet that I probably could remove 2 of the processors and likely not really notice any difference.. Perhaps I'll try that this weekend if I've got some time. |
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